[PATCH v2] ocfs2: retire ocfs2_drop_inode() and I_WILL_FREE usage

[Mateusz Guzik <mjguzik@gmail.com>]

This postpones the writeout to ocfs2_evict_inode(), which I'm told is
fine (tm).

The intent is to retire the I_WILL_FREE flag.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
---

v2:
- rebase -- generic_delete_inode -> inode_just_drop

The original posting got derailed and then this got lost in the shuffle,
see: https://lore.kernel.org/linux-fsdevel/20250904154245.644875-1-mjguzik@gmail.com/

This is the only filesystem using the flag. The only other spot is in
iput_final().

I have a wip patch to sort out the writeback vs iput situation a little
bit and need this out of the way.

Even if said patch does not go in, this clearly pushes things forward by
removing flag usage.

 fs/ocfs2/inode.c       | 23 ++---------------------
 fs/ocfs2/inode.h       |  1 -
 fs/ocfs2/ocfs2_trace.h |  2 --
 fs/ocfs2/super.c       |  2 +-
 4 files changed, 3 insertions(+), 25 deletions(-)

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index fcc89856ab95..84115bf8b464 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -1290,6 +1290,8 @@ static void ocfs2_clear_inode(struct inode *inode)
 
 void ocfs2_evict_inode(struct inode *inode)
 {
+	write_inode_now(inode, 1);
+
 	if (!inode->i_nlink ||
 	    (OCFS2_I(inode)->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)) {
 		ocfs2_delete_inode(inode);
@@ -1299,27 +1301,6 @@ void ocfs2_evict_inode(struct inode *inode)
 	ocfs2_clear_inode(inode);
 }
 
-/* Called under inode_lock, with no more references on the
- * struct inode, so it's safe here to check the flags field
- * and to manipulate i_nlink without any other locks. */
-int ocfs2_drop_inode(struct inode *inode)
-{
-	struct ocfs2_inode_info *oi = OCFS2_I(inode);
-
-	trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno,
-				inode->i_nlink, oi->ip_flags);
-
-	assert_spin_locked(&inode->i_lock);
-	inode->i_state |= I_WILL_FREE;
-	spin_unlock(&inode->i_lock);
-	write_inode_now(inode, 1);
-	spin_lock(&inode->i_lock);
-	WARN_ON(inode->i_state & I_NEW);
-	inode->i_state &= ~I_WILL_FREE;
-
-	return 1;
-}
-
 /*
  * This is called from our getattr.
  */
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index accf03d4765e..07bd838e7843 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -116,7 +116,6 @@ static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
 }
 
 void ocfs2_evict_inode(struct inode *inode);
-int ocfs2_drop_inode(struct inode *inode);
 
 /* Flags for ocfs2_iget() */
 #define OCFS2_FI_FLAG_SYSFILE		0x1
diff --git a/fs/ocfs2/ocfs2_trace.h b/fs/ocfs2/ocfs2_trace.h
index 54ed1495de9a..4b32fb5658ad 100644
--- a/fs/ocfs2/ocfs2_trace.h
+++ b/fs/ocfs2/ocfs2_trace.h
@@ -1569,8 +1569,6 @@ DEFINE_OCFS2_ULL_ULL_UINT_EVENT(ocfs2_delete_inode);
 
 DEFINE_OCFS2_ULL_UINT_EVENT(ocfs2_clear_inode);
 
-DEFINE_OCFS2_ULL_UINT_UINT_EVENT(ocfs2_drop_inode);
-
 TRACE_EVENT(ocfs2_inode_revalidate,
 	TP_PROTO(void *inode, unsigned long long ino,
 		 unsigned int flags),
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 53daa4482406..2c7ba1480f7a 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -129,7 +129,7 @@ static const struct super_operations ocfs2_sops = {
 	.statfs		= ocfs2_statfs,
 	.alloc_inode	= ocfs2_alloc_inode,
 	.free_inode	= ocfs2_free_inode,
-	.drop_inode	= ocfs2_drop_inode,
+	.drop_inode	= inode_just_drop,
 	.evict_inode	= ocfs2_evict_inode,
 	.sync_fs	= ocfs2_sync_fs,
 	.put_super	= ocfs2_put_super,
-- 
2.43.0